It hosts a few small hamlets inside, namely Dikchu, Pangthang, and Mangan and is managed by State Forest Department.

Inside this wildlife sanctuary, the primary ecoregions and their corresponding biomes are: All of these are typical of the Bhutan - Nepal - India hilly region.

Birds at Fambong Lho Wildlife Sanctuary include species like the hill partridge, satyr tragopan, fire-tailed myzornis, bar-throated minla, red-tailed minla, black-eared shrike babbler, scaly laughingthrush, streak-breasted scimitar babbler, rusty-fronted barwing, yellow-browed tit, red-headed bullfinch, crimson-browed finch, chestnut-crowned warbler etc.

Mammals regularly sighted include barking deer, yellow-throated marten, Himalayan brown bear and red panda.

Some very commonly seen mammals in this wildlife sanctuary are Himalayan striped squirrel and Royle's pika.